Improvement in grinding-mills



2' Sheets--Sheet 1. G. M. STONE.

Grinding man. No. 70,916. l Patented Nov. 12, 186.7.

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2 Sheets-Sheet 2i G. M. STONE.

Grinding Mill.

No. 70,916. 'Patented Now-i2, 1867. y

GILES M. STONE, OF ST. LOUIS, MISSOURI.

IMPROVMENT IN GRlNDlNG-MILLS.

Specification forming part of Letters Patent No. 70,9 16, (lated November 12, 1867.

To all whom 'it may concern Be it known that I, GILES M. STONE, of St. Louis, in the county of St. Louis and State of Missouri, have invented anew and Improved Cylinder, Grist, and Flouring Mill; and I do hereby declare that thefollowing is afull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming lpart of this specilication, in whieha Figure lis an end view of this invention. Fig. 2 is a side elevation of the same. Fig. 3

` is a perspective view of the same.

Similar letters of reference indicate like parts.

This invention relates to a grist and our mill in which the grain or other material to be ground is acted upon bytwo or'm ore pairs of cylinders, which are arranged in combination with suitable aprons or chutes, and with suitable gear-wheels, in such a manner that one cylinder in each pair revolves much quicker than the other, and that the grain or other material on passing through between each pair of cylinders is crushed and ground, and afterward conducted to the next pair of cylinders, and so on until it has attained the desired fmeness. One of the cylinders in each pair has its bearings in a movable frame, which is adjustable by a set-screw, so that the distance between the two cylinders can be adjusted at pleasure. One of the cylinders in the first pair is also vertically adjustable to bring it closer to or farther from the chute and prevent the escape of large particles to the second pair of cylinders.

A represents a frame, made of wood or any other suitable material, to the top of which is secured the hopper R, through which the grain or other material is fed to the grinding mechanism. This mechanism consists of two or more pairs of cylinders, A B, C D, and the grain or other material, on dropping from the hopper, is received by a shoe, S, which conducts it between the rst pair of rollers, A B.

`In order to obtain a uniform discharge of grain, `a shaking motion is imparted to the shoe by the action of a tappet-wheel, a, on a camlever, b, which connects with the shoe by an arm, c. The cylinder A is mounted on an axle, N', which has its bearings in a frame, O, to

which a sliding motion can be imparted by a screw, 0', which passes through a cross-bar in the main frame A and screws in the cross-bar of the adjustable frame O. By these means the cylinder A can be moved toward and from the cylinderB, which latter eylinderis mounted on an axle, L', that has its bearings in a vertical frame, Q. This frame is adjustable in a vertical direction by two screws, q, so that the cylinder B can be raised or lowered to suit circumstances, and brought closer to or farther from the apron or chute T, which serves to conduct the material to be crushed after the same has passed through between the rollers A B to the second pair of crushing-rollers, O D.

By moving the roller B close to the apron T, large lumps or pieces which may pass from the first pair of rollers are prevented from passing to the second pair of rollers. These lumps, by the action of said roller operating in connection with the front edge of the apron, are ground up and pulverized so as to pass through to the second pair of rollers, and thus the clogging ofthe chute T by the lumps is prevented, as they cannot accumulate faster than the edge of the chute and roller B will grind them.

The roller C is mounted on a shaft, K', which has its bearings in a frame, P, the position of which is adjustable by a screw, p', so that the roller O can be moved closer to or farther from the roller D. This roller is secured to an axle, E', which has its bearings in stationary boxes, and to which asuitablepulley is secured, whereby the whole mechanism is set in motion.

The motion from the axle E' is transmitted to the axle K by a bevel-gear, F G, and a spurgear, H I, the wheels H and Gbeing mounted on a shaft, G', which has its bearings in suitable arms extending from the main frame A', as seen in Figs. l and 3, while the spur-wheel I is secured to the axle K' of the roller D.

The size of the several cog-wheels is such that the motion of the roller D is much slower than that of the roller O.

From the shaft K' of the roller O the motion is transmitted to the roller B by means of cog-wheels K L, one of which is mounted on the shaft K', and the other on the shaft L', as shown in Fig. 2, and another pair of cogwheels, M N, transmits the motion from the roller B to the roller A. The proportion of the cog-wheels K L and M N is such that the speed of the rollers is gradually reduced, and particularly the roller A is made to revolve much slower than the roller B. By this arrangement the rollers A and B have a slow and powerful motion; and, furthermore, by causing the roller A to revolve slower than the roller B the material to be crushed is exposed to a grinding as well as to a crushing action, and the operation of the millis materially facilitated.

A grist and ouring mill is thus obtained: the cylindrical grinders or crushers of which can be made of stone or any other suitable material, and which is so constructed that all its parts are durable and not liable to get out of order, and that grain or other materials can GILES M. STONE.

Witnesses:

BENJ. R. SINGLETON, CHARLES E. GAssEL. 

